Q6 of 51 Page 330

The dielectric strength of air is 3.0 × 106 V/m. A parallel-plate air-capacitor has area 20 cm2 and plate separation 0.10 mm. Find the maximum rms voltage of an AC source which can be safely connected to this capacitor.

Given: Dielectric strength of air (E) = 3.0 × 106 V/m,

Area (A) =20 cm2 and separation width (d) = 0.10 mm.


Potential difference (V) across the capacitor is




The maximum rms voltage of an AC source which can be safely connected to this capacitor will be given as




More from this chapter

All 51 →
4

An electric bulb is designed to operate at 12 volts DC. If this bulb is connected to an AC source and given normal brightness, what would be the peak voltage of the source?

 5

The peak power consumed by a resistive coil when connected to an AC source is 80W. Find the energy consumed by the coil in 100 seconds which is many times larger than the time period of the source.

 7

The current in a discharging LR circuit is given by i = i0e–t/τ where τ is the time constant of the circuit. Calculate the rms current for the period t = 0 to t = τ.

 8

A capacitor of capacitance 10 μF is connected to an oscillator giving an output voltage ϵ = (10V) sin ωt. Find the peak currents in the circuit for ω = 10 s–1, 100 s–1, 500 s–1, 1000 s–1.